I find these BD-R DLs to be very reliable. It's too early to speak of durability, but I can say I've never owned any of the coasters I've used. I prefer 50GB drives for most applications - they're big enough to hold a decent amount of data, yet very reasonably priced. I have used 100GB drives but they are expensive and not that reliable at the moment. My recommendation is to stick with these 50GB drives for now.
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